Numbers, data, facts.

Measurement recording and processing with the GLD 202 Leak Detector.

Signal and frequency analysis

• analog range limits 10-50,000 Hz
• digital sampling rate 128,000 samples per second
• data compression of the relevant measurement data to 1 kilobyte/second
• multi-channel spectral analyses
• Fast Fourier Transform (FFT) from 50Hz-50kHz
• transient recognition with classification, window width 2 ms
• recognition of marker signals in noise
• integral of the energy from 20-40kHz (results like the MLD 201)
  • average value over 1000ms (100 measurements)
  • peak values in 35kHz and 72Hz channels to identify markers
  • virtual marker recognition

Analog measurement processing

Pressure

• recording with piezoresistive sensor
• recording of the pipeline pressure 0 to 80 bar (atmospheres, 0 to 1176 psi)
• resolution 10 bits, < 0.1 bar (atmospheres, <1.8 psi)
• measurement accuracy 1%

Temperature

• temperature of the medium: 0 to 40/50°C (32 to 130-148°F)
• resolution 10 bits, < 0.1°C (0.2°F)
• measurement accuracy 1%

Time

• date and time
• resolution 1 sec

Digital measurement processing

Distance

• counting the signal impulses from the optional odometer
• two separate channels
• recognition of the direction of travel
• resolution <1m (3.3ft)

Battery life

• Monitoring of the charge and discharge, auto-matic switching to sleep mode when batteries are discharged.

Storage of measured values

• Currently on digital camera-type SD (Secure Digital) card, with a capacity limited only by card size (recording duration more than 200 hours)